Question

Define the following terms
•Active tranport
•Diffussion
•root pressure •ascent of sap​

Answer 1

Answer:

diffusion is the mixture of two or different things

Answer 2

Explanation:

What is an active transport ?

Active Transport is defined as a process that involves the movement of molecules from a region of lower concentration to a region of higher concentration against a gradient or an obstacle with the use of external energy.”

Types of Active transport

There are two types of active transport namely:-

• Primary active transport
• secondary active transport.

What is Diffusion?

Diffusion is the process of movement of molecules under a concentration gradient. It is an important process occurring in all living beings. Diffusion helps in the movement of substances in and out of the cells. The molecules move from a region of higher concentration to a region of lower concentration until the concentration becomes equal throughout.

Types of Diffusion

Diffusion is widely used in various fields such as biology, physics, chemistry, etc. Diffusion can be classified into two main types:

• Simple diffusion
• facilitated diffusion.

What is root pressure ?

Root pressure is a force or the hydrostatic pressure generated in the roots that help in driving the fluids and other ions from the soil in upwards directions into the plant’s vascular tissue – Xylem. This process is produced by osmotic pressure in the cells of the root. Root pressure is more common during the spring seasons before the leaves develop and the rate of the transpiration is rapid.

The effects of root pressure can be seen only during nights and in the early morning as the rate of evaporation is very low. The main contribution of the root pressure is to establish the continuous movements of the water molecules in the xylem which can be affected by the transpiration.

What is ascent of sap ?

The ascent of sap in the xylem tissue of plants is the upward movement of water and minerals from the root to the crown. Xylem is a complex tissue consisting of living and non-living cells. The conducting cells in xylem are typically non-living and include, in various groups of plants, vessels members and tracheids. Both of these cell types have thick, lignified secondary cell walls and are dead at maturity.

• Although several mechanisms have been proposed to explain the phenomenon, the cohesion-tension mechanism has the most evidence and support.
• Although cohesion-tension has received criticism, for example due to the apparent existence of large negative pressures in some living plants, experimental and observational data favor this mechanism